Pierre Langlois
Laval University
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Featured researches published by Pierre Langlois.
Applied Optics | 1985
Pierre Langlois; Roger A. Lessard; Alberic Boivin
A laser beam impinging at grazing incidence on a 3-D surface produces a diffraction edge wave whose obliquity factor contains, among other things, the information concerning the local radius of curvature of the surface in the plane of incidence. In this paper we show how to retrieve this curvature radius information from light irradiance measurements of the edge wave and from exact electromagnetic diffraction calculations. This new method of optical metrology gives the curvature radius of a surface in the incident plane and at a given point by a single measurement at that point, while other techniques depend on a scanning or a mapping in the vicinity of the point of interest. Moreover, a measuring system using this diffractional method is very easily implemented and can yield a precision in the 5–10-μm range. Experimental results are presented for six metallic circular cylinders and two metallic spheres.
Journal of The Optical Society of America A-optics Image Science and Vision | 1985
Pierre Langlois; Alberic Boivin; Roger A. Lessard
We present an expression for the electromagnetic-diffraction edge wave produced by a three-dimensional Gaussian beam at grazing incidence upon an absorbing circular cylinder whose radius is much greater than the wavelength. The good conductor and the perfect conductor are included as special cases. Moreover, the edge-wave expression is valid in the Fresnel region as well as in the far field.
Applied Optics | 1975
Roger A. Lessard; Pierre Langlois; Alberic Boivin
Canadian Journal of Physics | 1985
Pierre Langlois; Alberic Boivin
Canadian Journal of Physics | 1985
Pierre Langlois; Alberic Boivin; Roger A. Lessard
Canadian Journal of Physics | 1983
Pierre Langlois; Alberic Boivin
Archive | 1985
Pierre Langlois; Roger A. Lessard
Archive | 1984
Pierre Langlois; Roger A. Lessard; Alberic Boivin
Archive | 1984
Pierre Langlois; Alberic Boivin; Roger A. Lessard
Journal of the Optical Society of America | 1979
Pierre Langlois; Alberic Boivin